Sound-box.



G. USTEN.'

SOUND BOX.

APPLLGATION FILED MAY zo, 1908.

91 3, 1 53. Patented Eeb. 23, '1909.

' [Lg J INVENTOR. Qywmsbsw Geoge 05132772A ATTORNEY:

GEORGE OSITEN, OF DENVER, COLORADO.

SOUND-BOX.

Specification of Letters Patent.- i

Patented Feb. 23, 1909'.

Application filed May 20, 1908. Serial No. 433,815.

To all 'whom it may concern:

Be it known that I, GEORGE Os'rEN, a citizen of the United States of America, residing at Denver, in the county of Denverl and State of Colorado, have invented certain -new and useful Im rovements in Soundconstruction and the addition of an auxiliary diaphragm, will reproduce sound clearer, more distinct and sonorous than in constructions heretofore known. I attain this object by the mechanism illustrated in the accom anying drawing in the various views of whic like parts are similarly designated and in whichy Figure 1- represents a face view of the improved sound box, Fig. 2- a section taken along a line 2 2, Fig. 1, and Fig. 3- an enlarged, fragmentary sectional view of the needle holder and adjacent parts.

In constructing the improved device, I employ a cylindrical box 2 which comprises an annular portion 3 and a plate 4, which, being fitted in one of the ends thereof, is provided with an outwardly extending, central tubular conduit 5, through which the sounds, reproduced by thev vibratory movement of the diaphragms, are transmitted to the horn with which it connects. The portion 3 is formed with an interior, annular flange 6 which supports the diaphragm 7 between two rubber packing rings 8 and 9,r

the outer one of whic is engaged by a split ring 10 which, by frictional contact with the internal surface of the member 3 of the box, holds the diaphragm in place. A second diaphragm 11, composed of a suitable metalhc substance, is held between the first named dia hragm 7 and the plate 4l and in spaced re ation thereto, by engagement with the opposite side of the flange 6 and ani inwardly exten .ding peripheral rim 12 on the plate 4. The auxiliary diaphragm 11 has a central o ening 13, through which the sound vproducedp by the principal diaphragm 7, which is usually composed of mica, may pass into the orifice of the tubular conduit 5 of the plate 4. The o ening 13 is preferably made larger than t e therewith axially alined orifice of the-conduit so that vthe sounds produced by the diaphragm 7, may pass between the plate 4 and the auxiliary diaphragm 11, to-imparta vibratory movement to the latter.

The needle bar 14, one extremity of which engages the' outer surface of the diaphragm 7, projects, at its opposite end, into an opening in the head 15a of the needle holder 15,' which extends through a slot formed by a depression 16 in a boss 17 on the annular member 3, and a thereto secured strap 18, and which is adjustably held in place by means of a spring catch 19 which, )eing secured at one of its extremities upon the peripheral surface of the box, projects through an o ening in the strap 1 8, to engage, with its ree extremity, ono of a plurality of notches 20 formed in the holder 15. The needle 21 is secured in an o ening in the head 15a, in alinement with t e bar 14, by means of a set screw 22.

The advantages derivedfrom the use of the improved sound box will be readily understood by thosefaniiliar with the art.

As the needle 21 travels through the groove in the rotating cylinder or disk of the phonograph, the mica diaphragm is set in vibration and the sound waves,-produced by this vibratory movement, are propagated to the metallic diaphragm 11 which in consequence, receives a vibratory motion 1n umson with that of the principal diaphragm and thereby amplifies the undulations which,

being augmented by those passing directly through the opening 13 in the diaphragm, into the conduit 5, will cause the sounds emitted from the horn, connected therewith, to be-clear, distinct and sonorous.- By making the opening 13 larger than the oriiic(` of the ronduit, the passage of the waves of vibration into the space between the auxiliary diaphragm 11 and the plate 4,is greatlyfacilitate'd. The diaphragn111,the thickness of which is equal to or less than that of themiea diaphragm, is preferably positioned midway between the latter and the plate-l at equal distances theref1oiu,tho distances between the members being determined by the nature and thickness of the metallic substance of which the auxiliary diaphragm is composed.

Having thus described my invention what I ciaim is z- 1.- ln a, device of the class named, tho roui-I bin-ation of a sound box open at one of its ends, a sound transmitting,conduit connect- IOL ing with its opposite end, a diaphragm Within the box and an auxiliary', iexible, metallic diaphragm interposed between the irst named diaphragm and the said conduit, andV having an opening opposite to and of rgreater diameter than the orifice of the latter.

2. In a device ofthe class named, the cornbination of a sound-box open 'at one of its ends,' a sound transmitting conduit` connected withan opening in its o posite end, a diaphragm within the box an an auxiliary `diaphragm interposed between the first named diaphragm and the 'conduit and having, opposite the s aid opening, an a ertureI whose area is not less than that of -t e said oriiice.

3. In a device ofthe class named, the come v bination of a sound box open at one of its `ends, a sound transmitting conduit oonnected with a central opening in its opposite end, a diaphragm within the box and an auxiliary flexible, metallic diaphragm interposed between the iirst named diaphragm and the closed end of the box in roximity to the latter and having a=centralp greater diameter than the said opening.

In testimony whereof I have affixed my signature in presence of two Witnesses.

GEORGE OSTEN. Witnesses G. J. ROLLANDET, K. M. STUMP.-

aperture of 25 

